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			Hello, 
 I just took a look into NAVAJAS ANTIGUAS - ANTIQUE CLASP KNIVES by Rafael Martinez del Peral y Forton.
 In picture 018 on page 19 You can see a Navaja very similar to the Navaja shown in style as well in the detail of being a slip joint (it's the one on the right).
 The book says 19th century Albacete.
 
 Greetings, Helge
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